gfx/2d/ImageScaling.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef _MOZILLA_GFX_IMAGESCALING_H
   8 #define _MOZILLA_GFX_IMAGESCALING_H
   9
  10 #include "Types.h"
  11
  12 #include <vector>
  13 #include "Point.h"
  14
  15 namespace mozilla {
  16 namespace gfx {
  17
  18 class ImageHalfScaler
  19 {
  20 public:
  21   ImageHalfScaler(uint8_t *aData, int32_t aStride, const IntSize &aSize)
  22     : mOrigData(aData), mOrigStride(aStride), mOrigSize(aSize)
  23     , mDataStorage(nullptr)
  24   {
  25   }
  26
  27   ~ImageHalfScaler()
  28   {
  29     delete [] mDataStorage;
  30   }
  31
  32   void ScaleForSize(const IntSize &aSize);
  33
  34   uint8_t *GetScaledData() const { return mData; }
  35   IntSize GetSize() const { return mSize; }
  36   uint32_t GetStride() const { return mStride; }
  37
  38 private:
  39   void HalfImage2D(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
  40                    uint8_t *aDest, uint32_t aDestStride);
  41   void HalfImageVertical(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
  42                          uint8_t *aDest, uint32_t aDestStride);
  43   void HalfImageHorizontal(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
  44                            uint8_t *aDest, uint32_t aDestStride);
  45
  46   // This is our SSE2 scaling function. Our destination must always be 16-byte
  47   // aligned and use a 16-byte aligned stride.
  48   void HalfImage2D_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
  49                         uint8_t *aDest, uint32_t aDestStride);
  50   void HalfImageVertical_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
  51                               uint8_t *aDest, uint32_t aDestStride);
  52   void HalfImageHorizontal_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
  53                                 uint8_t *aDest, uint32_t aDestStride);
  54
  55   void HalfImage2D_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
  56                      uint8_t *aDest, uint32_t aDestStride);
  57   void HalfImageVertical_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
  58                            uint8_t *aDest, uint32_t aDestStride);
  59   void HalfImageHorizontal_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
  60                              uint8_t *aDest, uint32_t aDestStride);
  61
  62   uint8_t *mOrigData;
  63   int32_t mOrigStride;
  64   IntSize mOrigSize;
  65
  66   uint8_t *mDataStorage;
  67   // Guaranteed 16-byte aligned
  68   uint8_t *mData;
  69   IntSize mSize;
  70   // Guaranteed 16-byte aligned
  71   uint32_t mStride;
  72 };
  73
  74 } // namespace gfx
  75 } // namespace mozilla
  76
  77 #endif